Learning Objective

In this lesson we will revise the classification of matter and atomic structure.

Learning Outcomes

By the end of this lesson you will be able to:

• Distinguish between pure substances and mixtures.

• Distinguish between elements and compounds.

• Describe the arrangement of atoms in pure substances.

• Describe the subatomic structure of atoms, including protons, neutrons and electrons.

• Define atomic number and mass number, and explain what isotopes are.

• Describe the configuration of electrons for the first 20 elements.

(Image: vchalup, Adobe Stock)